Airport information
- FAA LID
- 3U9
- Coordinates
- 46.2116, -112.1060
- Elevation
- 4,968 ft MSL
- Magnetic variation
- 17E
- Sectional chart
- GREAT FALLS
- Airport use
- Public
- Control tower
- No
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- GREAT FALLS
- NOTAM facility
- GTF
- Attendance
- UNATNDD
- Segmented circle
- Yes
- Wind indicator
- yes
- Activated
- 1963/07
- Distance from city
- 2 S
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-21
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 04:58 AM | 10:58Z |
| Sunrise | 05:37 AM | 11:37Z |
| Sunset | 09:24 PM | 03:24Z |
| Evening civil twilight Loggable night begins | 10:03 PM | 04:03Z |
Plan a flight from 3U9
Night operations
- Pilot-controlled lighting
- Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement ↗
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.
Traffic pattern
- Landing
- Rwy 11 · 113°
- Pattern
- left (turns left)
- TPA
- 6,000 ft MSL (≈1,000 AGL)
- CTAF
- 122.9
Enter the left downwind for Rwy 11 at 6,000 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 11/29
3,675 ft × 72 ft · Turf (Fair)- Heading
- 113° mag · 130° true
- Markings
- nonstandard
- Traffic pattern
- Left
- Heading
- 293° mag · 310° true
- Markings
- nonstandard
- Traffic pattern
- Left
| Runway | Length | Your margin |
|---|---|---|
| 11/29 | 3,675 ft |
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| HIA · Whitehall | VORTAC | 113.70 | r349° / 21.2 NM |
| HLN · Helena | VORTAC | 117.70 | r179° / 24.6 NM |
| CPN · Coppertown | VOR-DME | 111.60 | r052° / 28.8 NM |
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- NONE
- Powerplant service
- NONE
- Parking
- tiedowns
Ownership & management
Remarks FAA
- NO SNOW REMOVAL
- NO PHONE ON AIRPORT.
- -2 FT DRAINAGE DITCH +1 FT BERM WEST SIDE OF RY FULL LENGTH; 43 FT FM RY 11/29 CNTRLN.
- FOR CD CTC HELENA APCH AT 406-449-5756/5761, WHEN APCH CLSD CTC SALT LAKE ARTCC AT 801-320-2568.
- RY 11/29 THLDS & EDGES MARKED WITH WHITE CONES
- HAS 1% TO 3% UPHILL GRADIENT FROM RY 29 END TO RY 11 END.
Nearby airports
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 3U9 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About 3U9
Boulder Airport (3U9) is an airport in Boulder, MT, at 4,968 ft MSL. It has 1 runway, the longest 3,675 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 3U9, refreshed from the Aviation Weather Center and FAA NASR.
Does 3U9 have a control tower?
No. Boulder Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at 3U9?
Boulder Airport has 1 runway; the longest is 3,675 ft. See the Runways tab for headings, surface, and lighting.
Where is 3U9?
Boulder Airport is in Boulder, MT, at an elevation of 4,968 ft MSL. Coordinates: 46.2116, -112.1060.
Fly out of 3U9 often?
Save 3U9 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.